Ignition-magneto



J. B. STARK.

IGNITION MAGN-ETO.

APPLICATIGN FILED APR. 26, 1919.4

Ihbww Q N ma Y I mm .O l Sm 6fm S. @S 7., m o 6 l o J. R. STARK. IGNITION MAGNETo.

APPLICATION FILED APR. 26. 1919.

1,342,607. Y Patented June 8., 1920;

3 SHEETSSHEET 2.

1TH. STARKl ylGNmoNV MAGNETO. APBLICATIOYN FILED APR. 26. 1919.

1,342,607. M Patenfedzrunes, 1920.

3 SHEETS-SHEET 3.

Mib *fr Q @y u UNITED STATES-PATENT ortica;

JOHN ROY STARK, OF RACINE, WISCCNSIN, ASSIGNOR T0 WEBSTER ELECTRIC COMPANY, 0F RACINE, WISCONSIN',

A CORPORATION OF XVISCONSIN.

IGNITION-MAGNETO.

Specification of Letters Patent.

Patented June 8, tgl).

To all 'whom t may concern.'

Be it'known that l, JoHN ROY STARK, a citizen of the United States, residing at Racine, in the county of Racine and State of lllisconsimhave invented a certan new and useful Improvement in Ignition-halagnetos, (Case 7,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to ignition magnetos, and primarily has for its object the provision of a device of this class which is capable of developing a good starting spark and of developing` good sparks at the lower engine speeds when the armature or rotor of the magneto is driven at compara* tively low rate of speed. Briefly, 1 accomplish these objects:

First: By the provision of means, which .may be under the control of the engine operator, adapted, at the lower engine speeds, for instance when operating with retarded spark, to accelerate the relative motion between the armature or rotor and the pole faces with which it cooperates; and

Second: Bythe provision ofnovel means, which likewise may be under the control of the operator, for accelerating the operation of the primary circuit interrupter contacts.

Before proceeding to a detailed descrip-- tion of the ignition magneto of my invention, which will be best understood by relierence to the accompanyingdrawings, I will point out that I have illustrated the improvements which characterize my present invention in connection with amagneto, which, in such of its parts as constitute no part of my present invention, may, if desired, be substantially like the ignition magneto disclosed in the co-pending application of ArthurC. Kleckn'er and wWalter Brown,

`Serial No.v 271,576, filed July 17, 1919. In

the following description I will therefore make but brief reference to those vfeatures of the magneto machine with the details of which my present invention is not particularly concerned. It is to be understood, however,l that the application of the improvements of my-v invention to a machine of the Kleckner & Brown type is merely representative, as the novel features of my invention are capable of application in a great many types of ignitionmaegnetos In the accon'ipanying drawings illustrating my invention:

Figure 1 is a view illustrating' in axial section those parts ot the ignition magneto with which my invention is concerned;

llig. 2 is an end view taken ou line .-2 of Fig. l and looking in tl1eilii-e ition indicated by the arrows, this View illustrating` 'particularly the interrupter, its mounting, and means for its operation;

Fig 3 is a fragmentary sectional view taken on the line ,fl-3 of Fig. 1, looking in the direction indicated by the arrows;

Figs is a t'ei'tical sectional view taken on the line ld of Fig. 1, looking in the direction indicated by'd the arrows; and

Fig. 5 is fragmentary vertical sectional View similar to ll1 the parts in ychanged position.

Similar characters of reference reiter to' similar parts throughout the several views.

The drawings illustrate a magneto coinprising the two-part housing 10, the lower part of which constitutes the machine frame, its removable end closure 10, magnets ll, pole pieces 12 cast in the machine frame, transformer and condenser housing 1-3, and. distributer devices indicated the reference numeral 14. not concerned with the details of these ele ments of the machine. They may he of the Klecliner t Brown tyi e, as illustrated, or they may be of any other desirabl struction.

Mounted between the pole pieces l2 is a cylindrical timing sleeve 15, comprising the magnetic segments 152-152 which, as is well known in the art, in effect constitute adjustable faces for the pole pieces 12, and the .non-magnetic segments 15b, 15h. The timing sleeve may, if desired, be of substantially the saine construction as the one shown and described in the Kleclrner & lli-own application previously .mentioneth but not necessarily so. Generally speaking, timing sleeves otthis type are well known in the` art, and l contemplate applying the improveniente to be hereafter,mentioned to any suitable form of timing sleeve.

As is best shown in Fig. l, the leit-hand end of the timing sleeve 15 is provided with a'bearing 16 formedintegral with, or ca ried by, the machine frame as shown, whereas the right-hand end otthe timing sleeve, or more specifically', `its end closure 17g is i gli My invention is ig. d but showing certain of as a whole by winding- 21, the said core and winding beine'- Supported in a non-magnetic armature frame comprising` the non-magnetic seamen tal side pieces 22,22 which bridge the spaces between the segmental ends ol the l-shaped larninze 20and thus give the entire armature structure a true cylindrical shape. The details of the armature are, however, not particularly important, in so lar as iny invention'is concerned.

The armature is provided with trunnions 23 and 2ffl,the trunnion 2b heine provided with a ball hearing 25 in the left-hand end ot' the timing' sleeve (hier: 1), and the trunsnion 24- hein y I" ovided with a similar hall hearing 26 carried by the end closure 1T ol the timing sleeve, 'tac said trunnion 524i ef'- tending' through the inaggjnetic housingI end closure '10 and being; adapted to have the usual n'leans for driving' the armature attached thereto. lt 'will be assumed 'that in the operation ot the present machine the armature shaft is driven in what would he the clockwise direction in iti s. 2 and il, and the counter clockwise direction in Figs. l and ln so tar as the intorruliter inechanisn'i is concerned, my invention relates to the mounting' and method ot' operatingr the interruptor Vcontacts rather than to the particular way in which the circuit connections of the magneto are made. ythe lixcd and movable interrupter contacts are illustrated respectively at Q7 and 28 in Fig. 'l`he .fixed contact is carried by a suitable screw Qi), carried by a lue Ill). lornied ii curul with a brush `holder ill, carried by, but insulated from. the left-hand end oil the timing` slecvc l5 litigi'. l), the said brush holder provided with a suitable cylindrical brush 3Q and its cooperatingA sprin; A Bil. which tends h,- hold the brush in contact with thc insulated contactl segment 254. rthe construction olI the parts just described is substantially similar to the. corr sponding parts shown in the ltlccln'ier S; lr'rown applicationl he'lore mentioued.y and inasmuch as the .rescnt invention is not concerned with thc magneto circuit connections. it will sullice to say that the surface olE the segment fil with whica brush 32 cooperates is ot sullicicnt length lo insure Contact between the brush and the segment at any position to which thc tiininpy sleeve may he moved by the devices presently no4-geo? to be described. lt is to be understood that the segment 341 constitutes part oli the insuv lated sideoli the primary circuit. The armature winding` 21 has one end thereof grounded to the armature Vtrame and timingA sleeve 15, whereas the other end ol the armature winding is insulated and connected with the insulated coiuluctor 255, which ex tends through the armature trunnion 2&3, as illustrated in Fig. 1. The spring arm :SG carried by the terminal 3T bears against the exposed end of the insulated conductor 35. and a suitable insulated conductor indicated at 3S leads troni the terminal il? as a part ol1 the insulated side oi the primary circuit. The several devices thus 'lardescrihed are particularly adapted to be used in connection `with the specific circuit arrangement shown and described in the lleclner S: .llrown application, but in so la r as my presA ent invention is concerned. the circuitI con nections intermediate the terminal il? and the insulated interrupter contact are immaterial. -Those ol Klei-luier it lrown may be employed, but that is not essential.

The grounded interruptor contact Qta' is carried l., the spriiniy ill). forming` a part oi' the contact arm il), which is pivotally mounted upon. and electrically connected with, the ai'ljaccnt end ol the timingy sleeve l5 at -lll, the said contact arm provided with vthe plugA l2 cooperating; with the rain l-l. carried by the armature trunnion 23. The operation oi the cooperating` interruptor contacts 27 and 28 etlects the opening and closing ot the primary circuit in the usual manner.y lilith the interrupter sleeve stationary and the interruptor cam lil rotating in a clockwise direction (Fig. Q), the separa tion ol the interrupter contacts would be el'lected substantially like any ordinary pri mary circuit interruptor. lloweif'er. as will presently he described in detail. i provide, fmeans arranged and adapted to more the timing' sleeve. and conscduently the intcrruptcr contacts und the parts by which they are carried. in a direction opposite to th.'A direction oll rotation ol the cani lil. so that the separation olA 'the contacts by the cani il is el'rcted at a much higher rate ol' speed than would he the case. were the relative inotion between the cam Vlil and its coi-iperatin;l insulated contact arin plug` lf2 accone piished solely by the normal rotation of the cani 472i.

lne `neto traine may. iii desired. he prcwf'idcd u ith a. ,frroundine brush carried within the brush holder LVifi, and held in coin tact with the lett-hand end of the armature iii-ame (hier, l) by the sprin; v i6, thc groundinel brush extendingi` through an elongated slot JVi7 in the timingsleeve to permit engagement between the grounding brush -liand the arn'ialure traine reglardlcss` ot the posi. tion to which the timing sleeve may be lill ' posed eround :tlie 'timing sleeve l5 :ner e moved in the operation' of the magneto. in so far as this descrintion is concerned it will suilice to say that tbe brush ed Serves to, insure electrical connection between the grounded eide of tire armature winding. 'die magneto freine7 'the timing sleeve9 which, being mourn d in the bearings in tlic magneto freine, is; or course in ele "trionfi contact therewith.

Referring now more 'particularly to F l, d and 5, it will be noted that l beve oise e. ring,` d8. which is edjnstnbly inounted in the bearing 49 integral with, or carried by, the machine freine, es shown. Forming e port the ring d8, end extending; through e euiteble slot 50 in the housing l0., if mining le ir ie Sinnvn in erbrzince pois. indicated by dotted 5l, wir "li in Figs. et und retard position. The .of the timing lever lines in Fig. 5.

lt will be noted that the rin the timing lever 5l forms pnprovided with n perilgihcrnl innge 52., i ine1 tivo pins and 5e. A coiloifi signing 5f in e channel' formed in tlie pw nl' 56 forming n. part of the ti Re. has one end tnereoi nttncbod and theotlier end ',fl

57, which i? a lio portion oi' tlie innige {it} oi? 'the The springb ie constantly under Leneion., and thus tends et all tiniee to bold tbe lng in engagement w.' il ne pin iilue i -in Fig, e. llt Wi be nipulating the 'n l sleeve may be g'iv L. with respect to tlimits of tbe more capable. 'li bearing et? lie timing sleeve provided with i 58, Wbereon is vor il; e lever-59, -tlie other enr.

.L im, ien ene eG e ite ite ende 'nl n; I

lis provided vfnn talee '53., e engaged. for tbe purine pla-ined, by tile .i other suitable fixed upon the will be noted that away. ne indicated L. leverel and tiret tl housing is aperitnred in end of iever 6l to trevei to position. e

Referring to 3, end, 'for tl disregnrding tbe functions of lili and cano 6,2, it will be understood tl operation of the armature tbe :ceY current wevegenerzrted in Windi tained .twice in .eeen revolution, e or the 'treiline edeee ort tbe G- SJ lfunin 2O have left the magnetic pole face segments.) 15a, 15 of the timing sleeve, the occurrence of the Wave peak being advanced oi' retarded by the adjustment of the timing sleeve with respect to the pole pieces l2, 12- rlflie generation of the current as just de-I scribed, and the. functions attributed to the timing Sleeve magnetic it, l5 are Well known in the art.

Hcretoore lgreat diiliculty line been 'encountered in magneto ignition due to the fact tiret nt starting und at the lower engine Speeds, with vthe rotor of the magneto being slowly driven, thc movement between the armature or rotor and its cooperating pole feces line been too slowto create n satisfactory current in the generating Winding.

Likewise, due to the saine iezisonftlizit is,

et )die lower engine speeds-tlie opening of tlieinterruptor contacts :is e general rule line been slow, which of course has had a serious. effect upon the ultimate spark. These diiiiculties ere overcome by the zirrnngeinent herein described.

n the operation of iny magneto, assuming the timing lever to be in the retard position eiioivn in il, the anni 62, acting through `the lever o9., cerises the timing Sleeve inovc .in n. direction opposite theft ernieture rotation et tbe tinic tiret the 'trailing eifgee of the armature core sectors nre leevtbe oole fece'segnients of'ltlie timing e. Thus, tbe relative movement be- 'tween the armature sind pole feces wis mete! rie-.ily accelerated. with e, coi"espondingly more repid change in the magnetic linee foto ns assume that in vdie operation ot' the 'ning-neto the ei'nnitnre vsind com G2 have reecbed tbe positions illustrated in Fig. 5. this view the arnnitureis rotating in e counter clockwisse direction, and its trailing segments oi" tlie timingSleeve.I At this instant the carni acting against iever),

ee to inove tbe timingl Sleeve,L and conse di Lntiy tbe pole fece e k .;n'iente, which are 'e of the sleeve.) in e directionJ opposite ci armatore rotition and against the on oif spring` 'Llnie the separation or trailing edges oi'tlie armature and g ne fece Segmente of the timing sleeve is accelerated. This operation' is repeated es the armatore coiitinues to rotate, the com 62 moving the g sleeve in e direction op- @osito that or erinetnre rotation twice for every revolution ot tbe armatore, the spring' 55 tending et il tinnen#J to'boid' the. lever 59 in engagement rtlz. the cam '62.

'it will be Tetood that inthe use of roy magneto e regler-'erin be held pole face Segments edges are about to leave the magnetic pole til) in the "retardl position at starting and whenever, at the lower engine speeds, itis desired that the cam and lever mechanism just described shall function. lWhen the timing` lever is moved to the advance position indicated by dotted lines in Fig. 5, the lever 59 is held in such position that the cam 62 cannot act thereon to move the timing sleeve, 'as previously explained. Furthermorc, with the timing` lever in advance position, the lever 62 and connected mechanism not only tail to function, but the magnetic pole tace segments ot the timing sleeve are held in the proper spark advance position.

lilith the timing lever in cretard position and the cam and lever mechanism acting` periodically to oscillate the timing sleeve` as hereinbctore described, a quicker separation o't` the interruyriter contacts is accomplished than would be the case were not the timing sleeve thus periodically oscillated. All ot the iutcrrupter devices except the interruptor 'am Ll?) being carried by the timing sleeve, it will be seen that when the peak ot the current wave is attained and the armature and timing` sleeve are simultaneously moving in opposite directions, the relative movement between cam lr and interrupter arm plug yl2 is much greater than would be the case were the armature alone being moved. Consequently, the interrupter contacts are rapidly separated and the desirable quick break in the prin'iary circuit effected. lt is common knowledge that a quick break in the primary circuit is highly desirable and has a material cllect upon the high tension current created in the secondary circuit.

W'Vhile. l have illustrated butone embodiment ot my invention, and have shown my invention as applied to but one l'orm ot coinniercial magneto, it is to be understoml that l do not so limit nriysellE but claim all the embodiments ot my invention coming within the scope of the appended claims.

lWhat 'l claim as new and desire to secure by liet-ters Patent of the llnited States is:

l. in ignition magneto coinirising in combination pernianent magnets, pole pieces 'for said magnets, a sleeve between 'said pole pieces providing segmental laces for said pole pieces, an armature mounted for rotation within said sleeve, and means operated by the armature adapted periodically to move said sleeve in a direction opposite thatI ot armature rotation.

2. din ignit-ion magneto comprising in combination permanent, magnets', pole pieces tor said magnets, a sleeve between said pole pieces providing` segmental laces i'or said pole pieces, an armature rotatable within said sleeve, and mechanism driven simultaneously with the armature adapted periodically to move said sleeve in a direction opposite that of armature rotation.

-pieces therefor, a timing sleeve con'iprising magnetic segments constituting monable i'aces tor said pole pieces, an armature mounted t'or movement within said sleeve, a ring mounted `for movement around said sleeve, a timing lever attached to said ring, a stop on said ring, a stop on said sleeve, spring means acting between said ring and said sleeve tending to hold said stops in engagement one with the other, link and lever mechanism connected with said sleeve, and a Iam on the armature shaft arranged periodically to act on said link and lever mechanism to move said sleeve in a direction opposite that of armature rotation in opposition to said spring means to accelerate the separation ot armature and pole At'aces .l'or the purpose setiorth. n

5. An ignition magneto comprising in ciunbination with permanent magnets, pole pieces there'lor, a timing sleeve comprising magnetic segments constituting movable taccs for said pole pieces, an armature mounted Vfor movement within said sleeve, a ring mounted l'or movement around said sleeve, a timing lever attached to said ring, a stop on said ring.y a stop on said sleeve, spring mea-ns :ating between said ring and said sleeve tending to hold said stops in en.- gagement one with the other., link and lever mechanism connected with said sleeve, and a cam on the armature sha tt arranged pcriodically to act on said link and lever mechanism to move said sleeve in a direction opposite that ot armature rotation in opposition to said spring means to accelerate the separation ot armature and pole faces, said timing lever when in one position holding said link a nd lever mechanism in operative relation to said cam, a ndavhcn in another position holding' said link and lever mechanism out ol. operative relation to said cam. t3. di magneto comprisingl in combination with permanent. tield magnets and a generatingl winding, a` rotor ctmtinnously driven `when the magnet-o is in use, to vary the magnetic flux through said generating winding. shittable polea'iaces cooperating with said rotor, and means arranged and adapted periodically to move the said pole laces in a direction opposite that ol rotor movement llo 2&1'. An ignition niagnoto comprising; in.

combination iiold nnlgnot, u. Sleeve, nn annutino, a lever connected to Suid sleeve, a cani on the armature shaft for inoving said level' to rotate Suid sleeve :1nd spring means to rostoi'e Said sleeve to its no1-mul position.

25. An ignition magneto comprising in combination Hold magnets, ai. sleeve, :in zu* maturo, a ring` on Suid slo'eve, n timing lever v 0n Said ring, lover invchzinisni connected 'to said sleeve, :1 cum on 'the zn'nmtin'o shaft n1'- ranged normally to engage said lovoi' anni nienns operated by sai@l timing,` lover to hold said lover mechanism in inoperative or operativo position.

in Witness: whereof, l hereunto subscribe my name this 3rd (lay of April, 1919.

JOHN ROY STARK. lvitnesses P. Gr. CREWS,

l E. NELSON. 

